“…Sixteen studies were identified, which examined the effect of aggression management training on aggressive incidents. Six studies (37.5%) provided supportive evidence that staff training programs may reduce levels of aggression (Flannery et al, 1998;Goodykoontz & Herrick, 1990;Mortimer, 1995;Phillips & Rudestam, 1995;Sullivan et al, 2005;Walters & Kay, 2004), four studies (25.0%) provided mixed results (Martin, 1995;Needham et al, 2004;Nijman, Merckelbach, Allertz, & Campo, 1997;Whittington & Wykes, 1996), and six studies (37.5%) reported negative or nonsignificant results (Bowers et al, 2006;Carmel & Hunter, 1990;Helmuth, 1994;McCue, Urcuyo, Lilu, Tobias, & Chambers, 2004;Meehan, Fjeldsoe, Stedman, & Duraiappah, 2006;Smoot & Gonzales, 1995). The supportive research includes the only randomized control trial to evaluate the effectiveness of staff training for reducing aggression (Phillips & Rudestam, 1995).…”